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With nothing attached to Output 1 of the 850 Universal Interface, click RECORD and record until the mean Current stops changing (about a minute). Record the value of the mean Current in the Zero Current column of the Equivalent Circuits table. Enter the same value in each of the three rows. Record the Output Voltage on your table in all 3 rows.3.Set up the circuit shown in Figures 1 & 5 on the previous page.4.Click Preview and wait until the Average Current stops changing. Record the value of the mean Current in the Avg. Current column of the Equivalent Circuits table. “True Cur” = “Avg. Current” – “Zero Current”.5.Using the “True Current” values and Equation 1 from Theory, calculate the total resistance (experimental) of the circuit. Enter the value in the Experimental Resistance column of the table.6.Set up the circuit shown in Figures 2 & 6 on the previous page. Repeat steps 4 & 5.7.Set up the circuit shown in Figures 3 & 7 on the previous page. Repeat steps 4 & 5.
Page 10 of 9Equivalent Circuits – Data SheetPHY232Name: __________________________________________________ Date: ______________Conclusions: Equivalent Circuits1.How well does the method of equivalent circuits work?QUESTIONS PART B: Ohm’s Law1.How could this experiment be performed with an ammeter and batteries instead of the 850 Interface?2.Make a diagram of the circuit. Include the direction of charge flow. Represent positive charges with a “+.” Represent negative charges with a “-.”3.What is the physical meaning of the slope for the Voltage vs. Current graphs? 4.What is the physical meaning of the vertical intercept for the Voltage vs. Current graphs?5.Starting with y = mx + b, write an equation that represents the relationship between Voltage vs. Current for the resistors. Don't forget to include units on all numbers.6.Why is the voltage-current relationship different for a light bulb vs. a resistor? Output Voltage(should be ~15 V)Zero CurrentAvg. CurrentTrue CurrentExperimental Resistance